Well casing scraping tool



Nov. 30, 1954 w. E. COYLE wsu. CASING SCRAPING TOOL 3 Sheet's-Sheet 1 Filed July 21, 1952 IL an: E'. Cog Le will INVENTOR ATTORNEYS.

Nov. 30, 1954 w. E. COYLE 2,695,673

WELL CASING SCRAPING TOOL Filed July 21, 1952 3 Sheets-Sheet 2 wilgzam E". Gayle EN'TOR ATTGRNEYS Nov. 30, 1954 w. E. COYLE 2,695,573

WELL CASING SCRAPING TOOL Filed July 21, 1952 s Sheets-Sheet :5

ATTORNEYS.

Em a I I t am E. Co g le I\IVENTOR United States Patent WELL CASING SCRAPING TOOL William E. Coyle, Cotton Valley, La.

Application July 21, 1952, Serial No. 300,070

Claims. (Cl. 166-170) This invention relates to a well casing scraping tool and more particularly to a tool capable of being connected to a drill'collar, of a well drilling equipment.

The primary object of the invention is to scrape from the wall of a well casing any deposits which may tend to collect thereon and constrict the passage through the casing.

Another object is to expand against the wall of the well casing the scrapers to insure complete contact with the wall of the well casing of the scraper elements to be certain that all foreign matter deposited on the well casing will be engaged by the scrapers as the scrapers are moved relative to the well casing.

The above and other objects may be attained by employing this invention which embodies among its features an elongated tubular body having a helical groove opening through opposite ends and the outer periphery thereof, means carried by said body adjacent one end thereof for coupling said body to the drill collar of a drill rig, a resilient helical scraper mounted in the helical groove and projecting outwardly from the body for scraping deposits from the interior of the well casing, a scraper head carried by the body and extending longitudinally therefrom adjacent the end thereof remote from the drill collar, said head engaging one end of the helical scraper and holding it in the groove, and circumferentially spaced outwardly extending well casing scraper blades carried by the head.

1 In the drawings, l

Fig.1 is a fragmentary sectional view through a well casing showing this improved scraper in place therein,

Fig. 2 is a verticalsectional view through the scraper illustrated in Fig. 1,

Fig. 3 is a transverse sectional view taken substantially on the line 3-3 of Fig. 1.

Fig. 4 is a transverse sectional view taken substantially on the line 4-4 of Fig. 2,

Fig. 5 is a transverse sectional view taken substantially on the line 5-5 of Fig. 2,

Fig. 6 is an enlarged side view of the helical scraper removed from the body of the device,

Fig. 7 is a fragmentary enlarged sectional view taken substantially on the line 77 of Fig. 6,

Fig. 8 is a view similar to Fig. 1, of a modified form of the invention, and

Fig. 9 is a vertical sectional view through the scraper illustrated in Fig. 8.

Referring to the drawings in detail a scraping tool designating generally 10, comprises an elongated tubular body 12 carrying at one end a threaded stud 14, by which the tool is detachably coupled to the drill rig for lowering into a well casing. Entering the opposite end of the tubular body 12 is an internally screw threaded socket 16, the purpose of which will hereinafter appear. Formed in the periphery of the body 12 and opening through the periphery and opposite ends thereof is a helical groove 18, the side walls 20 of which lie parallel to one another but incline downwardly toward the end of the body 12, having the socket 16 therein as they approach the periphery of the body. Mounted in the helical groove 18 is a helical scraper designated generally 22, comprising a helical body 24, having parallel wise walls 26, which as shown in Fig. 2, extend between the side walls 20 of the helical groove 18, when the helical scraper 22 is in place in the body 12. The inner wall 28 of the helical scraper 22 is so formed as to leave a space between the bottom of the groove 18 and the 2,695,673 Patented Nov. 30, 1954 scraper to permit the scraper to move inwardly and outwardly relative to the body 12 as it moves in the casing C, it being understood that the body 24, of the scraper 22 is formed of a resilient material such as spring steel. In the preferred form of the invention, the body 24 of the helical scraper 22 is provided at spaced intervals with notches 30 (Fig. 6) to increase the flexibility thereof so that the helical scraper may be readily contracted for introduction into well casing and yet will expand into contact with the inner wall thereof. The outer peripheral surface 32 of the body 24, contacts the well casing C and formed at the junction of the outer peripheral surface 32 with the side 26 of the body 24 adjacent the socket 16, of the body 12, is a ledge or lip 34 carrying at its edge remote from its body a sharpened scraper edge 36 which serves, as the tool is reciprocated within the casing C, to scrape deposits from the wall of the casing. The end of the helical scraper 32, adjacent the threaded boss 14, is engaged by the drill collar (not shown) by which the device is held in the well casing C and threadedly entering the internally screw threaded socket 16 at the opposite end of the body 12 is an ex: ternally screw threaded boss 38 carried at one end of a scraper head designated generally 40, the opposite end of which is provided with an internally screw threaded boss 42, to which drill tools (not shown) may be attached. The head 40 comprises an elongated tubular body 44, having formed in its periphery circumferentially spaced radially disposed recesses 46 which open through the periphery of the body for receiving radially moveable scrapers 48. Each scraper 48 comprises an elongated body 50 carrying adjacent opposite ends outwardly extending retaining ears 52 which project longitudinally from the bodv 50 and are held in place in the recesses 46 by suitable clamp plates 54 having elongated longitudinally extending slots 56 extending therethrough. Extending through the slots 56 of the clamp plates 54, and projecting outwardly beyond the periphery of the body 44 are convex surfaces 58 which as illustrated in Fig. 5, recede circumferentially from the leading edges to provide scraping edges 60 which contact the well casing. Bowed leaf springs 62 are seated against the innermost walls of the recesses 46 and bear against the inner sides of the scrapers 48 to yieldingly urge the convex portions 58 thereof into contact with walls of the well casing. As illustrated in Fig. l, the head 40 engages the adjacent end of the helical scraper 22 to cooperate with the drill collar in holding the helical scraper in the helical groove.

In the modified form of the invention illustrated in Figures 8 and 9, a scraping tool designated generally 10 embodying all the features of the scraping tool 10 carries at one end a scraping head 40' embodying all of the features of the scraper head 40. Carried at its other end is a scraping tool designated generally 64 and comprising an elongated tubular body 66 having formed in one end an internally screw threaded socket 68 for the reception of the threaded boss 14' of the tool 10 as will be readily understood upon reference to Fig. 9. The body 66, like the body 12 of the tool 10 is provided with a helical groove 70 corresponding in all respects to the groove 18 of the body 12 with the exception that the pitch of the groove 70 is the reverse of that of the groove 18. The groove '70 not only opens through the periphery of the body 66 but through opposite ends thereof, and supported in the groove 70 is a helical scraper designated generally 72 which corresponds in all respects to the helical scraper 22 with the exception of the fact that it is of reverse pitch. The end of the body 66 remote from the socket 68 is equipped with a longitudinally extending externally screw threaded boss 74 which is adapted to enter the drill collar of a drill rig and when threaded into position on the drill collar, the drill collar will engage the adjacent end of the helical scraper 72 to hold it in place in the body 22.

In using the device illustrated in Figures 1 through 7 inclusive, the boss 14 is threadedly engaged with the drill collar and the scraping tool lowered into the casing C to be rotated about its longitudinal axis so that the scrapers 48 and the helical scraper 22 will contact the walls of the well casing C and remove any deposits which may be adhering thereto. Obviously the device may be reciprocated within the well casing, if so desired and will with reciprocal movement remove any deposits which may be adhering to the well casing. Obviously owing to the tubular structure of the device the scrapings may be flushed out of the well casing'in a conventional manner. In reciprocating the device in the well casing, there may be a tendency of the scraping tool 10 to rotate about its longitudinal axis and loosen its coupling to its drill collar. In order to overcome the danger of loosening the tool from the drill collar, I have found it advantageous to employ the structure illustrated in Figures 8 and 9 in which the helical scrapers are disposed at opposite pitches so that the tendency of one to rotate will be offset by the tendency of the other to rotate in an opposite direction. In this way, the danger of accidental uncoupling of the device from the drill collar and other equipment is avoided.

While in the foregoing there has been shown and described the preferred embodiment of this invention it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What is claimed is:

1. A well casing scraping tool comprising an elongated tubular body having a'helical groove therearound opening through opposite ends and the outer periphery thereof, means carried by said body adjacent one end thereof for coupling said body'to a drill collar, a resilient helical scraper mounted in the helical groove and projecting outwardly from the body for scraping deposits from the interior or the well casing, a'scraper head carried by the body and extending longitudinally therefrom adjacent the end thereof remote from the drill collar, said head engaging one end of the helical scraper and holding it in said'groove, and circumferentially spaced outwardly lelxtending well casing scraper blades carried by said ead.

2. V A well casing scraping tool comprising an elongated tubular body having a helical groove thereabout, opening through opposite ends and the outer periphery thereof, means carried by said body adjacent one end thereof'for coupling said body to a drill collar, a resilient helical scraper mounted in the helical groove and projecting outwardly from the body for scraping deposits from the interior of the well casing, a scraper head carried by the body and extending longitudinally therefrom adjacent the end thereof remote from the drill collar, said head engaging one end of the helical scraper and holding it 'in said gr'oove,s'aidhead'having elongatedlongitudinally extending circumferentially spaced recesses opening through the periphery thereof, well casing scraper blades mounted in the recesses and extending outwardly therethrough beyond the peripheral confines of the head, and springs mounted in the recesses and bearing on the scraper blades for yieldingly urging said blades outwardly into contact with the wall of awell casing.

3. The structure defined in claim 2 in which the helical scraper has circumferentially spaced grooves extending therethrough and opening through the inner periphery'thereof to facilitate the flexing of said helical scraper.

4. The structure'defined in-claim 2in which a sharpened lip is carried by the helical scraper and extends from the side thereof adjacent the head at the junction of said side with the outer periphery of the scrapen,

5. A well casing scraping tool-comprisingan elongated tubular body having a helical groove'thereabout" opening through oppositeends and the outer 'peripheryther'eof, means carried by said 'body adjacent one end {thereof for coupling said body to a drill collarga 'res'ilie'nthelical scraper-mounted in the helical groove'and projecting outwardly from the body for scraping deposits -'fr'o'm the interior ofthe well casing, a scraper headcar'ried by the body and extending longitudinally therefrc'n'n adjacent the end thereof remote from the drill collar, said head engaging o'ne end of the helical scraper and holding it in groove, aseCondelongated tubular body connected to the first mentione'd tu'bular body an'd e'xtending longitudinally therefrom in axial alignment therewith adjacent the end thereof remote from the head, said second tubular body havinga helical -groove opening through opposite ends andaround the periphery thereof, said last-named helical groovefbeing reversely pitched with respect to the first mentioned helical groove, and a second resilient helical scraper'mounted'in the last named helical groove and extending 'outwar'dlyfromthe second mentioned body for engaging the wall of the well casing and scraping deposits therefrom.

References Cited in the file of this patent UNITED STATES PATENTS 

